JPH08269238A - Vibration-proofing rubber composition and polyphenylene ether resin/vibration-proofing rubber composite material containing the same - Google Patents

Abstract

PURPOSE: To provide a vibration-proofing rubber composition having excellent adhesiveness to a PPE resin especially a styrene-modified polyphenylene ether resin and therefore being bonded thereto without using any adhesive by covulcanization in molding. CONSTITUTION: This vibration-proofing rubber composition comprises 65-85wt.% natural rubber, 15-35wt.% styrene/butadiene rubber and 40 pts.wt. or above, based on 100 pts.wt., in total, above rubbers, carbon black and develops adhesiveness when it is mixed with a vulcanizer and heat-treated on a modified polyphenylene ether resin and a polyphenylene ether resin-vibration-proofing rubber composite prepared by heat-treating a mixture thereof with a vulcanizer on a modified polyphenylene ether resin.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention is a polyphenylene ether resin (hereinafter sometimes abbreviated as PPE resin).
The present invention relates to a heat resistant anti-vibration rubber composition having adhesiveness to.
More specifically, it is possible to use a PPE resin / vibration rubber composite in place of the metal material / vibration rubber composite, which is useful for automobiles and the like, and a PPE resin / vibration rubber composite. Regarding

[0002]

2. Description of the Related Art Anti-vibration rubber used when mounting an engine of an automobile has anti-vibration performance for reducing engine vibration and accompanying noise, heat resistance against heat generated by the engine, and engine. In addition to mechanically supporting performance (strength), it is required to have adhesiveness with a metal material or the like that serves as a supporting material for the anti-vibration rubber. From the standpoint of anti-vibration performance, rubber is generally suitable as soft as it is, but if it is too soft, it will bend due to the weight of the load and its support position will change, adversely affecting the basic performance of the entire structure including the support. Will affect. Specifically, the smaller the spring constant (dynamic spring constant) of the vibration state for transmitting vibration is, the better the vibration isolation performance is, and the larger the static spring constant indicating the support rigidity is, the better the support performance (strength) is. It can be said that a rubber having a smaller ratio of the dynamic spring constant to the static spring constant, that is, the value of the dynamic magnification (dynamic spring constant / static spring constant) is superior as a vibration isolating rubber.

On the other hand, as a support material for a vibration isolating rubber, a metal material has been used up to now as a metal material / antivibration rubber composite obtained by vulcanizing and adhering a vibration isolating rubber on a metal support material. For further improvement, a lighter material to replace metal is desired. Heat resistant PP as such material
E resin is attracting attention, but in order to realize a composite of PPE resin and anti-vibration rubber, when a vulcanizing agent is added to the anti-vibration rubber composition and heat-treated on the PPE resin, it is added to the PPE resin. It is necessary to have a sufficient adhesive force with the vulcanized rubber. As a prior art in which a PPE resin and a rubber material are compounded, a PPE resin blended with a styrene polymer is used, and a styrene-butadiene rubber (SBR) and a butadiene rubber (BR) containing a double bond in the rubber material are used. ), Isoprene rubber (IR), isobutene-isoprene rubber (IIR), and the like, there is a document (JP-A-5-30182) describing a method for producing a composite in which both are co-vulcanized. It does not mention the characteristics (dynamic ratio) at all, and it is not a technology that can be used as it is for a vibration-proof rubber composite that uses natural rubber as the main rubber component because it requires support strength and durability as well as vibration resistance.

In the case of natural rubber, the adhesion performance with PPE resin is poor, and the problem of adhesion performance cannot be solved only by blending PPE with a styrene polymer or the like. Therefore, the present inventor has examined a method of blending natural rubber with a rubber containing a double bond such as SBR. Although the adhesive performance is certainly improved as the blending amount is increased, it has been found that the most important dynamic magnification characteristic as a vibration isolating rubber is deteriorated to a desired level or less, and that it cannot be put to practical use as it is. Therefore, an object of the present invention is to provide an excellent anti-vibration rubber composition that enables a PPE resin / anti-vibration rubber composite in place of a metal / anti-vibration rubber composite, that is, excellent adhesion to a heat-resistant and lightweight PPE resin. It is intended to provide a natural rubber-based anti-vibration rubber composition and a PPE resin / anti-vibration rubber composite using the composition.

[0005]

DISCLOSURE OF THE INVENTION The present inventors have found that the deterioration of the vibration damping property of a rubber composition obtained by blending styrene-butadiene rubber with natural rubber is eliminated by blending a specific amount of carbon black, and It was confirmed that the composition had good adhesiveness with the PPE resin, and the present invention was completed.

That is, the present invention includes 1) natural rubber, styrene-butadiene rubber, and 40 parts by weight or more of carbon black per 100 parts by weight of the natural rubber and styrene-butadiene rubber, and a vulcanizing agent. An anti-vibration rubber composition that exhibits adhesiveness when blended and heat-treated on a modified polyphenylene ether resin, 2) The blending ratio of natural rubber and styrene-butadiene rubber is 65-85% by weight of natural rubber, and ethylene-butadiene rubber. 15 to 35% by weight of the vibration-insulating rubber composition according to the above 1, 3) Natural rubber, styrene-butadiene rubber, and 40 parts by weight of carbon black per 100 parts by weight of the total of the natural rubber and styrene-butadiene rubber. A polyphenylene ether resin obtained by adding a vulcanizing agent to a composition containing 1 part or more of the composition and subjecting the composition to heat treatment on a modified polyphenylene ether resin. Nylene ether resin / vibration-proof rubber composite, 4) Polyphenylene according to 3 above, wherein the mixing ratio of natural rubber and styrene-butadiene rubber is 65-85% by weight of natural rubber and 15-85% by weight of styrene-butadiene rubber. An ether resin / anti-vibration rubber composite, and 5) the composite as described in 4 above, wherein the modified polyphenylene ether resin is a styrene-modified polyphenylene ether resin. Hereinafter, the anti-vibration rubber composition and the PPE resin / anti-vibration rubber composite of the present invention will be described in detail.

[0007]

[Anti-vibration rubber composition]

(1) Natural Rubber In the present invention, a natural rubber having good vibration damping properties, processability and mechanical strength properties (durability) is used as the vibration damping rubber polymer matrix (base).

(2) Styrene-Butadiene Rubber By blending styrene-butadiene rubber with natural rubber, the adhesion with modified PPE resin, especially styrene-modified PPE resin, is improved. The styrene-butadiene rubber used in the present invention is a random or block copolymer rubber obtained by copolymerizing styrene and butadiene, and preferably has a styrene content of 5 to 63% by weight, particularly 18 to 40% by weight.

The blending ratio of natural rubber and styrene-butadiene rubber is 65 to 85% by weight of natural rubber and 15 to 35% by weight of styrene-butadiene rubber. Natural rubber is 65
If it is less than wt% (styrene-butadiene rubber exceeds 35 wt%), the dynamic magnification characteristic deteriorates, and if natural rubber is 8
If it exceeds 5% by weight (styrene-butadiene rubber is 15
If it is less than weight%, the adhesive performance is deteriorated.

(3) Carbon black In the vibration-insulating rubber composition of the present invention, the addition of carbon black in a specific amount or more compensates for the deterioration of the vibration-damping property when styrene-butadiene rubber is mixed with natural rubber. Carbon black has an average particle size of 26 to 20.
0 nm, specifically HAF (High Abration Fu
rnace; average particle size 26-30 nm), FEF (FastEx
truding Furnace; average particle size 40-48nm), GP
F (General Purpose Furnace); average particle size 49-60
nm), SRF (Semi Reinforcing Furnace; average particle diameter 61 to 100 nm), and FT (Fine Thermal; average particle diameter 101 to 200 nm).

Satisfying the dynamic magnification, adhesiveness and durability, PP
The compounding amount of carbon black that enables the E resin / vibration-proof rubber composition composite has a lower limit of 40 parts by weight and an upper limit of 50 to 100 parts by weight depending on the type of carbon black. 75 parts by weight, FEF
Parts by weight, 90 parts by weight for GPF, 90 parts by weight for SRF, and 100 parts by weight for FT. If the blending amount of carbon black is less than 40 parts by weight, the adhesiveness due to co-vulcanization with the modified PPE resin will be insufficient. On the other hand, the upper limit is that the larger the average particle diameter is, the larger the amount of compounding is possible, but it is considered that the reason is that the larger the average particle diameter, the lower the reinforcing property. When the blending amount of carbon black exceeds the upper limit, the adhesion is good, but the dynamic properties, which are important properties as a vibration-proof rubber, deteriorate.

(4) Other Additives Further, a processing aid, an antiaging agent, a vulcanizing agent, a vulcanization accelerator, a softening agent, a filler and the like are added to the antivibration rubber composition of the present invention. You may use. In particular, when forming a complex with the modified PPE resin, it is preferable to previously mix a vulcanizing material (vulcanizing agent, vulcanization accelerator).

As the vulcanizing agent, any commonly used vulcanizing agent can be used. Examples of such compounds include sulfur,
Examples thereof include morpholine disulfide and tetramethylthiuram disulfide. Of these, sulfur is preferred,
About 0.5 to 5 parts by weight can be used per 100 parts by weight of the rubber component.

The vulcanization accelerator is an additive for suppressing radical cleavage of the rubber polymer and improving the crosslinking effect, and can be used in an amount of about 0.5 to 5 parts by weight per 100 parts by weight of the rubber component. Examples of the vulcanization accelerator include sulfites such as N-cyclohexyl-2-benzothiazole sulfenamide, N-oxydiethylene-2-benzothiazole sulfenamide, and N, N-diisopropyl-2-benzothiazole sulfenamide. Phenamide compounds; 2-mercaptobenzothiazole, 2- (2,4-dinitrophenyl) mercaptobenzothiazole, 2- (2,6-
Thiazole-based compounds such as diethyl-4-morpholinothio) benzothiazole and dibenzothiazyl disulfide;
Guanidine compounds such as diphenylguanidine, dioltotolylguanidine, triphenylguanidine, orthotolylbiguanide, diphenylguanidine phthalate;
Acetaldehyde-aniline reaction products, butyraldehyde-aniline condensates, hexamethylenetetramine, acetaldehyde-ammonia reaction products and other aldehyde-amines or aldehyde-ammonia compounds; 2-mercaptoimidazoline and other imidazoline compounds; thiacarbamide, diethylthiourea, Thiourea compounds such as dibutylthiourea, trimethylthiourea and diortotolylthiourea; thiuram compounds such as tetramethylthiuram monosulfide, tetramethylthiuram disulfide, tetraethylthiuram disulfide, tetrabutylthiuram disulfide, pentamethylenethiuram tetrasulfide; dimethyl Zinc dithiocarbamate, zinc diethyldithiocarbamate, zinc dibutylthiocarbamate, ethylphenyldithio Rubamin zinc, butylphenyl dithiocarbamate, zinc, sodium dimethyl dithiocarbamate, dimethyl dithiocarbamate selenium dithiocarbamate compound tellurium diethyldithiocarbamate and the like; Compound of xanthate-based compounds such as dibutyltin xanthate acid zinc.

The softening agent is used up to about 100 parts by weight with respect to 100 parts by weight of the above rubber component. Examples of softening agents include petroleum-based softening agents such as procell oil, lubricating oil, paraffin, liquid paraffin, petroleum asphalt, and vaseline; fatty oil-based softening agents such as castor oil, linseed oil, rapeseed oil, and coconut oil; tall oil. Waxes such as sub; beeswax, carnauba wax, lanolin; linoleic acid, palmitic acid, stearic acid, lauric acid, etc., and process oil is particularly preferably used.

Examples of fillers other than carbon black include calcium carbonate, talc, silica and the like.
In addition to the above additives, conventional compounding agents such as plasticizers, stabilizers, processing aids and colorants may be used.

The anti-vibration rubber composition of the present invention can be prepared by a conventional method using the above-mentioned natural rubber, styrene-butadiene rubber, carbon black, a vulcanizing agent and other additives. That is, after preliminarily mixing the respective components excluding the vulcanizing agent and the vulcanization accelerator, the mixture is kneaded at 80 to 140 ° C. for several minutes. After that, a vulcanizing agent, a vulcanization accelerator, etc. are additionally mixed into the kneaded product by using rolls such as an open roll, and the mixture is kneaded at a roll temperature of 40 to 70 ° C. for 5 to 30 minutes and then dispensed to form a ribbon or sheet. It can be obtained as a rubber composition.

[0018]

[PPE resin / anti-vibration rubber composite] Since the anti-vibration rubber composition of the present invention shows good adhesion to PPE resin, especially modified PPE resin, it is lightweight and has excellent heat resistance. A rubber composite can be manufactured. PPE resins include phenol, o-, m- or p-cresol, 2,6-, 2,5-, 2,4- or 3,5-dimethylphenol, 2-methyl-6-phenylphenol, 2, 6-diphenylphenol, 2,6-diethylphenol, 2-methyl-6-ethylphenol, 2,
3,5-, 2,3,6- or 2,4,6-trimethylphenol, 3-methyl-6-t-butylphenol,
Examples thereof include homopolymers such as thymol and 2-methyl-6-allylphenol, and copolymers of two or more of these. The modified PPE resin used in the present invention means the P
The PE resin is a resin modified with a styrene resin or a polyamide resin, and among these, a styrene-modified PPE resin is preferable. The styrene resin and the PPE resin have good compatibility, and the styrene-modified PPE resin can be obtained by melt-kneading the PPE resin and the styrene resin with an extruder or the like.

Adhesion between the modified PPE composition and the anti-vibration rubber composition can be carried out by co-vulcanization in one step or two steps. In the case of co-vulcanizing in one step, the two-color injection molding method or the like is used. That is, modified P
The melts of both the PE resin and the anti-vibration rubber composition are introduced into the same mold and then heated and vulcanized. In the case of co-vulcanizing in two steps, for example, a modified PPE resin is molded in advance, and a vibration-proof rubber composition preferably pre-molded on the molded product is compression-molded, extrusion-molded, transfer-molded,
It is extruded by injection molding or the like, pressed and then heated to be vulcanized. In any case, the vulcanization temperature is 150-18.
0 ° C. is preferable, and the vulcanization time is about 3 to 30 minutes.

The PPE resin / anti-vibration rubber composite of the present invention thus obtained is a composite component of an anti-vibration rubber for automobiles, specifically, engine mounts, body mounts, cab mounts, members. Mount, strut bar cushion, center bearing support, torsional damper, steering rubber coupling,
It can be used for various members such as tension rod bushes, bushes, bound stoppers, FF engine roll stoppers, and muffler hangers.

[0021]

The present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to the following description. In each of the examples and comparative examples, the following materials were used as raw materials and additives.

(1) Rubber component Natural rubber (NR): RSS # 3. (2) Styrene-butadiene rubber (SBR) SBR # 1500 (manufactured by Japan Synthetic Rubber Industry Co., Ltd.) having a styrene content of 23.5% by weight. (3) Carbon black (i) FEF: average particle size 43 nm, ASTM No.N-550, (i
i) GPF: average particle size 80 nm, ASTM No.N-660, (ii
i) SRF: average particle size 66 nm, ASTM No.N-774, (iv)
FT: Average particle size 72 nm, ASTM No.N-880, (v)
HAF: Average particle size 27 nm, ASTM No. N-330.

Examples 1 to 11 and Comparative Examples 1 to 8 The above-mentioned components are in the proportions shown in Tables 1 to 6, and the vulcanizing agents and additives other than the vulcanization accelerators are in the proportions shown below. Kneading was performed for 4 minutes at 120 ° C. using a Banbury mixer.
Next, the following vulcanizing agent and vulcanization accelerator were additionally mixed with the kneaded product using an open roll, kneaded at 50 ° C. for 2 minutes and then dispensed to prepare a sheet-shaped rubber composition.

[Other Additives and Their Blending Amount (Amount Based on 100 Parts by Weight of Polymer Component)] Sulfur (vulcanizing agent) 2 parts by weight N-cyclohexyl-2-benzothiazolesulfenamide (vulcanization acceleration Agent) 1.2 parts by weight Zinc white (vulcanization accelerator) 5 parts by weight Aroma process oil (softening agent) 5 parts by weight Stearic acid (softening agent) 2 parts by weight N- Phenyl-N'-isopropyl-p-phenylenediamine (amine-based antioxidant) 2 parts by weight.

The compounded rubber composition thus obtained was molded and crosslinked as described below to prepare a test piece, and the test piece was used to measure and evaluate hardness, dynamic characteristics and durability. Also PPE
Adhesiveness with resin (adhesive strength and breaking mode), the result is shown in Table 1.
It is shown together with ~ 6.

1) Hardness A compounded rubber composition was molded, heated at 150 ° C. for 20 minutes and crosslinked to obtain a dumbbell-shaped test piece (JIS K6301). Using this test piece, the spring hardness was measured with a JIS A hardness meter according to the method described in JIS K6301.

2) Adhesion The compounded rubber composition was molded into a cylindrical test piece having a diameter of 40 mm and a height of 15 mm, and the upper surface and the lower surface thereof had a diameter of 40 m.
m columnar styrene-modified PPE resin (Vestoran 1
900, manufactured by Huls), each attached to 165 ° C
And heat for 40 minutes to vulcanize and bond them. Next, after attaching circular metal fittings to the upper surface of the upper modified PPE resin and the lower surface of the lower modified PPE resin, respectively, the lower metal fitting is fixed, and the upper metal fitting is pulled upward to break. The load at break was taken as the adhesive force (kgf / cm ² ), and the state of the fracture surface (fracture mode) was measured and evaluated. In the table, "RX and PY" (X and Y are numbers from 0 to 100) in the breakage mode column causes X% breakage in the rubber composition portion and the modified P
This means that the PE resin portion was Y% fractured. For example, "R100" means that the rubber composition portion was 100% fractured.

3) Dynamic Characteristics A compounded rubber composition was heated at 150 ° C. for 30 minutes to form a cross-linked columnar test piece having a diameter of 50 mm and a height of 25 mm, and the upper and lower surfaces thereof had a diameter of 60 mm and a thickness of 6 mm. Each of the circular metal fittings of
s), dynamic spring constant (Kd100) is measured, and dynamic magnification (Kd100)
100 / Ks) was calculated. The static spring constant was calculated by reading the above-mentioned cylindrical test piece by 7 mm in the axial direction of the cylinder and reading the loads at the time of bending of 1.5 mm and 3.5 mm from the second load bending curve. The dynamic spring constant was obtained by compressing the test piece 2.5 mm in the axial direction and centering on this 2.5 mm compression position.
A constant displacement harmonic vibration having an amplitude of ± 0.05 mm was applied from below at a frequency of 100 Hz, a dynamic load was measured by a load cell attached above the test piece, and calculation was performed according to JIS K6394. Dynamic magnification is the ratio of these values.

4) Durability A test piece crosslinked by heating the compounded rubber composition at 150 ° C. for 30 minutes was incorporated into a measuring member shown in FIGS. 1A and 1B, and its durability was measured and evaluated. . The measuring member is a shaft of the thin-walled cylindrical metal fitting (1) in which the thick-walled cylindrical metal fitting (2) having an outer diameter of 10 mm and a height of 70 mm is placed in the inner hole of the thin-walled cylindrical metal fitting (1) having an outer diameter of 81 mm and a height of 49 mm. It is arranged so that it is located in the center, and both of these cylindrical metal fittings (1,
2) has a structure in which the test piece (3) is integrally connected, and the test piece (3) has a length L ₁ of 38 mm and is a part of a portion for connecting both the cylindrical metal fittings (1, 2). Width L ₂ is 22m
m, and the width L _{3 of the} portion to be fixed to the thick-walled cylindrical metal fitting (2) was 36 mm. Using this measurement member, in the direction indicated by the arrow in FIG.
With a load corresponding to a displacement of 14 mm, a constant vibration was performed at a frequency of 3 Hz, and the number of vibrations until the test piece (3) was broken was examined. Then, the durability of each anti-vibration rubber was evaluated by the number of times of vibration at the time of breaking (the number of times of breaking).

[0030]

[Table 1] Example 1 Example 2 Comparative Example 1 Natural rubber 75 ← ← ← SBR 25 ← ← Carbon black FEF 75 50 25 JIS A hardness 70 60 50 Adhesion Adhesion (kgf / cm ² ) 92.0 86.0 68.1 Failure mode R100 R100 R85, P15 Dynamic characteristics (Kd100 / Ks) 3.0 2.4 1.7 Durability (10,000 times) 9.7 10.5 11.2

[0031]

[Table 2] Example 3 Example 4 Comparative example 2 Natural rubber 75 ← ← SBR 25 ← ← Carbon black GPF 90 60 30 JIS A hardness 70 60 50 Adhesion Adhesive strength (kgf / cm ² ) 90.1 82.5 72.0 Destruction mode R100 R100 R90, P10 Dynamic characteristics (Kd100 / Ks) 3.0 2.3 1.6 Durability (10,000 times) 8.2 9.1 10.2

[0032]

[Table 3] Example 5 Example 6 Comparative Example 3 Natural rubber 75 ← ← SBR 25 ← ← Carbon black SRF 90 60 30 JIS A hardness 70 60 50 Adhesion Adhesion (kgf / cm ² ) 89.8 81.3 71.7 Breaking mode R100 R100 R89, P11 Dynamic characteristics (Kd100 / Ks) 2.9 2.3 1.6 Durability (10,000 times) 8.1 9.0 10.3

[0033]

[Table 4] Comparative Example 4 Example 7 Example 8 Natural rubber 75 ← ← SBR 25 ← ← Carbon black FT 150 100 50 JIS A hardness 70 60 60 Adhesion Adhesion (kgf / cm ² ) 93.2 83.4 73.6 Fracture mode R100 R100 R100 Dynamic characteristics (Kd100 / Ks) 2.9 2.2 1.5 Durability (10,000 times) 5.9 7.1 8.2

[0034]

[Table 5] Comparative Example 5 Example 9 Comparative Example 6 Natural rubber 75 ← ← ← SBR 25 ← ← carbon black HAF 60 40 20 JIS A hardness 70 60 50 Adhesion Adhesive strength (kgf / cm ² ) 87.8 75.4 66.3 Failure mode R100 R100 R82, P18 Dynamic characteristics (Kd100 / Ks) 3.5 2.7 1.9 Durability (10,000 times) 11.6 12.4 13.0

[0035]

[Table 6] Comparative Example 7 Example 10 Example 2 Example 11 Comparative Example 8 Natural rubber 95 85 75 65 55 SBR 5 15 25 35 45 Carbon black FEF 50 ← ← ← ← ← JIS A hardness 60 60 60 60 60 Adhesion Adhesion (kgf / cm ² ) 40.1 83.8 86.0 84.7 81.3 Destruction mode R50, P50 R100 R100 R100 R100 Dynamic characteristics (Kd100 / Ks) 1.7 2.1 2.4 2.8 3.3 Durability (10,000 times) 12.4 11.2 10.5 9.6 8.7

As shown in Tables 1 to 5, it is understood that as the blending amount of carbon black increases, the adhesiveness and hardness improve, but conversely, the dynamic characteristics and durability decrease. Among them, the samples of the present invention (Examples 1 to 9) in which the compounding amount of carbon black is limited to a specific range have good physical properties such as adhesiveness, dynamic characteristics and durability, and are excellent in balance of physical properties. You can see that Also, as is clear from Table 6,
The compounding ratio of natural rubber and styrene-butadiene rubber is 65 to 85% by weight of natural rubber and 1 of styrene-butadiene rubber.
It can be seen that 5 to 35% by weight is preferable.

[0037]

The anti-vibration rubber composition of the present invention comprises a PPE resin,
In particular, it has excellent adhesion with styrene-modified PPE resin,
The PPE resin / vibration rubber composite of the present invention can be bonded by co-vulcanization at the time of molding without using an adhesive, and is a lightweight PP that replaces the conventional metal / vibration rubber composite.
It can be used as an E resin / anti-vibration rubber composite for automobiles, and contributes to weight reduction and fuel efficiency improvement of automobiles.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a sample for durability test of anti-vibration rubber.

FIG. 2 is a sectional view taken along line II-II in FIG.

[Explanation of symbols]

 1 Thin-walled cylindrical metal fitting 2 Thick-walled cylindrical metal fitting 3 Rubber

Claims (5)

[Claims] 1. A modified polyphenylene containing natural rubber, styrene-butadiene rubber, and 40 parts by weight or more of carbon black based on 100 parts by weight of the total of the natural rubber and styrene-butadiene rubber, and blending a vulcanizing agent. An anti-vibration rubber composition exhibiting adhesiveness when heat-treated on an ether resin. 2. The blending ratio of natural rubber and styrene-butadiene rubber is 65-85% by weight of natural rubber and styrene-
The anti-vibration rubber composition according to claim 1, which comprises 15 to 35% by weight of butadiene rubber. 3. A vulcanizing agent is added to a composition containing natural rubber, styrene-butadiene rubber, and 40 parts by weight or more of carbon black based on 100 parts by weight of the total of the natural rubber and styrene-butadiene rubber. A polyphenylene ether resin / vibration-proof rubber composite formed by heat treatment on a modified polyphenylene ether resin. 4. A blending ratio of natural rubber and styrene-butadiene rubber is 65 to 85% by weight of natural rubber and styrene-butadiene rubber.
The polyphenylene ether resin / anti-vibration rubber composite according to claim 3, which comprises 15 to 35% by weight of butadiene rubber. 5. The polyphenylene ether resin / vibration-proof rubber composite according to claim 4, wherein the modified polyphenylene ether resin is a styrene-modified polyphenylene ether resin.